A quadrilateral has 4 sides but may not be symmetric.
Bretschneider's formula provided a method using side lengths and two opposite angles.
Any scalene quadrilateral can be divided into four triangles and the area is the sum of their areas.
(see the related link below)
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well change it into another quadrilateral and then take away the area of the lines you added
The formula for the area of a quadrilateral is... BASE*HEIGHT/3
The area of the quadrilateral.
Firstly, all quadrilaterals are four sided. That is a the definition of a quadrilateral - a four sided figure. One way is to find the area of each half (i.e. two triangles) and add them together. The area of a triangle is half the length of the base times the height.
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